Automatic obturator with variable opening for cine-picture taking apparatus



Dec. 29, 1936. .1. WEISSBRODT 2,065,777

AUTOMATIC OBTURATCR WITH VARIABLE OPENING FOR CINE PICTURE TAKING APPARATUS Filed May 22, 1935 3 Sheets-Sheet l Dec. 29, 1936. WEISSBRODT 2,065,777

AUTOMATIC OBTURATCR WITH VARIABLE OPENING FOR CINE PICTURE TAKING APPARATUS w Filed May 22, 1955 3 Sheets-Sheet 2 r 16 m I 1/ HRH Dec. 29, 1936. J. WEISSBRODT AUTOMATIC OBTURATOR WITH VARIABLE OPENING FOR CINE PICTURE TAKING APPARATUS I5 Sheeis-S'neet 3 Filed May 22, 1935 7 'to' the shaft '3, the fi nger l imparting a rotary. movement to the obturator -l',owiiig' to the hell? rator. The system of cranks is controlled byhand.

-bymeans of a button, thiscontrol' being possible either during the standstill of. the "apparatus or during its run: owing to friction the shaftdisdriven by the pinion-8 andtakes along the obgenital-15cc; 193g; V

OPENING Iron, CINE-PICTURE urnnmG APPARATUS j Jean Weissbrodh'fioulogne-sur-W,France applicaiion'myca 1935, Serial No. zzsse.

. InFran'ee May 23,1934

The present invention concerns an obturating device: with variable opening-for cine-picture taking apparatus and" the like, especially of the' type comprising two rotaryobturato'rs with two or more wings and mounted behind each other on the same shaft, the variations of the opening bemg secured by the lag of'one of these obturatb'rs.

with respect to the other. Q A

vice permits not only of a variation ofthe time names .found-and .foundenchained and con- -prcgressivelydecreasing exposition and then, in the case of found enchined in impressing, on

- the same portion of the-film, a series of pictures with increasing exposition, or inversely.

In the known devices of the specified type, the variationot the openingv is generally etfected by handf'with aid of a mechanisrnbu'ilt' for example in the following manner:

- Two obt11rators I, and. 2: (Fig. 1) for example with two wings, are mounted on a shaft 3 in front They are attachedto hubs and 's- (met and 3) fitted with friction on. the shaft 3 sliding in its longitudinal direction and carrying a grooved bushing '6. I This shaft isprovided with afinger I passingthrough a.longitudinal slit in the hu b 5 and a helicoidal slit in the hub'4. The hub 5 and consequently theobt'uratonz are attached to .a

*pinion B driven by themechanism of the apparatus.

. The variation of'opening is controlled by a sys- "tem-of-not represented-cranks'acting upon the bushing '6 'and "imparting: a shifting movement coidal slit-of theh-ub 4' connected'to-th-is 65m turator' l-owin-g to the finger "L- a Now the device's'of this-kind present a great drawback especially for the realization of the proceedings known as found and found en-' chainedi It' is known,. indeed; thatgthis propassa'ge of;the corresponding length of the film in frontof the objective.

'9. claims. (cue-19.3)-

'- variation of opening' -of'the -'by hand, as described above, thisvariation can The yariation of opening of the obturatingd: f

of exposition but als'oi'of the realization of tricks known in the cinematographic techn'ic under the Fig. 1 a diagrammatic view of the I6, s' and'ii" respectively.

Nfow it isjobvions that when 'the controllpf the 1 I. lodged inthe plate "and never, at ,prie part, be perfectly continuous and uniform, and, at the other part, the control of the speed of variation withregard to the chosen length of the film, will be diflicult and uncertain.

:AU'T OMATIC vsnuh V I obturator is -Thepresent invention has the purpose to obvlj atethis drawback,

- The invention is characterized a the fact: that the variable opening 01' the obturator is controlled automatically by the driving elements of the ap'- paratus throughthe of a mechanism de- [vised in a manner to render this variation of sisting in ta.kirig-: first a, series of'pictures with opening continuousand uniform. This mechanism comprises an engaging gear fied will he described hereafter merely invthe way -.of. examples and with reference .to the drawings appended. -In these drawings, represent;

bturator with variable opening, as above'referred to; Fig. 2, a view inelevatidn of thisgmechanism '-.'Fig.8isanaxialsection'throu hadetailofl the audible alarm device;

-. and of the obturator; lookingat the side of the elevations] Fig. 9, finally, is an axial section throughla part of the speed changing gear.

Fig.' Zshoiws a. thed crown 9 ofthe motor drum; meshing with a pinion llflxed on a shaft Journalle'd freely in the-easel! and in time l3 'o f the apparatusf'lhisshaft llfcarrles equally'a horse head I with slight frlction-withaid of agspring liandseveral pinion: l6, l6 and I6", (Fig.3). 1 p

The horse head ll-canies an equal number of pinions 11,. 11' and: i1" fixed to each other and loose on 'anaxle, They mesh with thepinlons Onan axle vided outwardly with a knurled button I! 'is fixed a pinion 28 (Fig. 2) which can mesh with the pinion i1 and is attached to an eccentric 2| provided with a slot for example in'the shape of a spiral of Archimedes, as indicated at 22 in Fig. 4.

The free extremity of the horse head I is supported by a projection 23 of the upper arm of a cranked lever 24 articulated to the frame of the apparatus and pulled upwardly by a spring 25.

The shaft 26 carries a crank 21 fixed to the same and is attached tothe system controlling the opening of the obturator, viz. to the crank 28 acting upon the grooved bushing 6.

A rod 3| articulated at 29 to the crank 21 is set into a to and fro movement by the eccentric 2| through the medium of a pin 32 fixed to this rod 3| and displacing itself along the slot 22. This rod is guided by .the axle l8'engaging a'slot 33 provided in this rod.

An outer button 34 maintained by a spring 35 applies against the upper arm of the lever 28 and serves for lowering this lever against the action of a spring 25.

On the shaft 28 is looselymounted a cam 38 comprising two beaks, the one 38 whereof applies against the prolongation of the axle 29 under the action of a spring 36', and theother beak 31 coacting with a finger 38 provided at the extremity of the lower arm of the cranked le ver2l. V V v The putting in gear of the mechanism is shown in Figs. 4 to 6 representing the parts effecting the engagement, the spiral 22 being. according to this The finger 38 integral with the finger 234s.

equally maintained in raised position and engages the beak 31 of the cam 38. On applying pressure on the button 34 the flng'er 23 is lowered and the horse head I4 is no more maintained and moves downwardly owing to friction, so that the pinion l1 engages the pinion 28, whereby the putting in gear is effected.

At the other part, the finger 38 is equally lowered and moves away from the beak 31 of the cam 38 which therefore'is so liberated and since it is solicited by the spring 38', it is taken along by the crank 21.

When the cam 38 commences its rotary movement under the action, of the crank 21, the finger 38 displaces itself along the outline of the cam which maintains in this way the mechanism in its en aged position.

On the cam arriving at the end of the stroke explained later on into its starting position shown in Fig. 4, the finger 38 is apt to engage anew the beak 31 so that the spring is permitted of raising the lever 2land thereby the horse head ll, whereby an automatic disengagement is effected.

On the contrary, when it is desired to vary the opening of the obturator by hand on turning the axle I8 by means of theknurled button IS. the crank 21, effects rotation of the shaft 28 without producing engagement, the cam 38 being impeded to rotate since it engages by the finger 38 l the beak 31, and the spring 38' will be alternately stretched, as shown in Fig. 6, and untensioned.

medium of the following parts: toothed crown 9,-

pinion I8, shaft II and pinions I6, l1 and 28.

On rotating the eccentric 2| takes along the pin '32 of the rod 3| which displaces itself in the slot 22 in the shape of a spiral of Archimedes of this eccentric. The rod performs consequently a to and fro movement and takes along with itself the crank 21 to which it is articulated at 29.

This crank rotates the shaft 26 and efiects in this way the variation of the opening of the ob-- turator, exactly in the same way as it is effected by the control by hand l9; I8, excepting anyhow that this variation controlled by a motor is produced in a continuous and uniform manner.

The crank-21, the rod 3| and its pin and the eccentric 2| are disposed in such manner that the pin occupies the point a where the spiral begins to. retrace its path when the cam is in its position of disengagement shown in Fig. 4.

Consequently it is obvious that to each rotation of the eccentric 2| corresponds a whole to and fro stroke of the rod and of the crank 21, so that at the end of the stroke of the crank 21the opening of the obturator returns to the size it occupies in its starting position, after having passed through the opposite value.

It follows therefrom that the mechanism works independently of the initial value of the opening of the obturator. This initial value is controllable by hand with aid of the knurled button l9.

In Fig. '7 another embodiment of the engagement device according to the invention is represented. The cam 38 is replaced by a shoe 38' slidable by means of two pins 38" and 38" in a second slit 33' of the rod 3|. The shoe applies through the medium of its lower left edge against the finger 38 of the cranked lever 24 and is moved toward the left by the spring 36'. When the mechanism is engaged by the lowering of the lever 28 the finger 38 is released, viz., no more kept by theshoe :0" and"the"latter displaces it'selftb gether with the rod 3| under the action of the spring 36'. At the same time the finger 38. travels along the lower border of the shoe, whereby the lever 24 is prevented from moving upwardly.

In order to obtain a found enchainedf. the startv is made either from the complete opening or from the complete closing of the obturator. The pictures are taken up to the moment when the opening of the obturator is closed, if the'start has beenmade in the opened position, or up to the moment of opening if the start has been made in the closed position, at which moment the taking of pictures must be stopped.

Now it is obvious from what has been said. that at this moment. the pin 32 of the rod 3| is at the summit b of the spiral 22.

In order to inform the operator that this point g has been attained, a sonorous device-see Fig. 8-

is provided, which comprises a pin 48 fixed to the pinion 28 attached to the eccentric 2 l ,and a hammer 4| fixed to the plate I3 in such manner that .when the pin 33 of the rod'3i is at the summit b nished to him by acounter of pictures 01 anyknown type.

In order to eflect this winding up, he must effect rotation of the toothed wheel l8 and of the shaft ii in a sense opposite to that of unwinding during the taking of pictures. The horse head l4 mounted with friction on the shaft l I will then be raised and will disengage the mechanism, so that the, value of the, opening of the obturator will not chang during winding up.

On re-starting the ta ing of views, the horse head l4 gets anew into its lowered position, the

mechanism will be engaged andthe opening of the obturator will continue up to its size at starting, corresponding to the end of the stroke of the crank 21, at which moment the disengagemerit will produce itself automatically owing to the finger 38 of the lever 24 being caught by the beak 31, as previously explained.

. If, on the contrary, it is not desired to make but a simple found, the taking of views will be arrested on hearingthe signal, and the open-v ing of the obturator will be regulated by hand, which opening by hand is rendered possible owing to the friction of the horse head. When restarting the taking of views the mechanism tending to produce the opening will work without any effect, owing to the friction, the opening having been already made by hand.

It is also possible to start the found with the closed obturator. For this purpose, the

camera being shut,.the knurled button attached to the eccentric must be turned after pressing down the button 34 until perception of the audible alarm, whereupon the taking of views is started.

In order to beable to make a more or less long found viz. one extending itself over a greater or smaller number of pictures moving in front of the objective during a period of variation of the able therein. This rod is rotary together with the shaft II and carries a spring blade, preferably a cord 44 of steel-wire whose one extremity 45 is fixed in a hdle46 provided for this purpose in said rod, whilst the other extremity which is free, is bent to form a boss 41. A longitudinal slit is provided in the. shaft ll, through which passesthe part of the spring 44 comprising the boss 41 which enters recesses such 48, provided in the pinions l6, l6 and I6", whereby the respective pinion into the recess whereof the said boss engages, will be rigidly connected with the shaft II. .The changing of speed can be hence very simply effected by pushing the rod 42 into the bore or by pulling said rod in contrary direction. This movement of the rod is limited byan arresting screw 49 engaginga slit 50 inthe shaft II, and the rod 42 is.provided with a recess it into which enters the spring 44 and its boss 41 during the passage from one pinion to the other. i

The speed of variation of the openinglof the obturator is in this way determined by the ratio of each one of the pairs of pinions -i6'l1"and l6 "--l|".

In the above described constructional form of the mechanism three different speeds can be obtained. This number can of course vary according to the requirements, since it is possible to provide as many pinions on the shaft H and on the horse head l4 as speeds are required.

Different other modifications can be provided,

within the scope of the present invention.

The spiral 22, for example, instead of being a spiral of Archimedes, may have any other suit- .able configuration.

be applied to any obturating dev e securing variable openings.

What I claim, is:

1. An obturating device for cinematographic cameras, comprising two shutters having opening sectors of the same size, the first shutter being fixed on a shaft actuated by the motor of the camera, the second shutter being fixed on a sleeve through which the first named shaft passes, the sleeve being provided with a hellcoidal groove, the shaft having a pin entering the said groove of the sleeve, a crank handle adapted to effect a sliding movement of the. carrying shaft ,of the first shutter in the carrying sleeve of the second shutter and for bringing about a variation in the position of the two shutters relatively to each other, a coupling device for inducing the operation of the said crank handle by means of the motor of the camera in a continuous and uniform manner, the said coupling device comprising a piniommeshing with a crown gear actuated by the motor of the camera, the said pinion being fixed to a shaft, a second pinion actuated by said shaft, a lever in slide friction on the said shaft, 2. third pinion loosely mounted on the said lever and in engagement with the second pinion actuated by the shaft, a fourth pinion adapted to enter into en'- gagement with the third pinion when the lever is loweredtowards the same, a cam fixedly connected with the fourth pinion, a'rod'connected with the cam and carrying a supporting shaft of the crank handle, the end of which is slidable in the supporting shaft of the first 'obturator for the purpose described.

2. An obturating device for cinematographic cameras, comprising two shutters having opening sectors of the same size, the first shutter being fixed on a shaft actuated by the motor of the camera, the second shutter being fixed on a sleeve through which the first named shaft passes, the

sleeve being provided with a helicoidal groove,

; the shaft having a pin enteringthe said groove of the sleeve, a crank handle acting on the said shaft for causing it to slide in the sleeve and for causing the pin of said shaft to slide in the heli- Tcoidal groove of the sleeve for the purpose of bringing about variation-in the respective posi-, tions of the opening sectors of the two shutters relatively to each other, a coupling deuice for rendering operative the said crank handle by the motor mechanism of the camera in a continuous and uniform way, said coupling device including a...

lever carrying a pinion and adapted to engage another pinion which is fixedly connected with a cam comprising a plate, a, groove provided in one of the faces of the plate and having spiralic form, said groove being adapted to receive a pro-' jection mounted on a bar for guiding said bar,

the bar supporting a shaft, said crank handle being keyed to said shaft and the end of said crank handle acting on the carrying shaft of the first shutter to bring about its sliding movement and to induce the displacementof. the two shutters from each other.

'3. An obturating device for cinematographic cameras, comprising two shutters having opening sectors of the same size, the first shutter being ,fixed on a shaft actuated by the motor of the camera, the second shutter being fixed on a sleeve through which the first named shaft passes, the sleeve being provided with a helicoidal groove, theshaft having a pin entering the said groove of the sleeve, a crank handle acting on the said shaft for causing it to slide in the sleeve and and uniform way, said coupling device including alever rocking under slide friction on a shaft controlled b'y the motor of the camera, a pinion carried by said shaft and in engagement with a pinion loosely mounted on said lever, the said loose pinion being adapted to engage another pinion when the lever is lowered towards the last named pinion, said last named pinion being-fixed- 1y connected with a cam, a rod connected to the cam and carrying a shaft, said crank handle being mounted, on said shaft, the end of saidhandle acting on the supporting shaft of the first shutter to slide the sameand to bring about the displacement of the two shutters from each other, and a manual control device for the raising and lowering of the said lever respectively.

4. An obturating device for cinematographic cameras, comprising two shutters having opening sectors of the same size, the first shutter being fixed on a shaft actuated by the motor of the'camera, the second shutter being fixed on a sleeve through which the first named shaft passes, the sleeve being provided with a helicoidal,

groove, the shaft having a pin entering the said groove of the sleeve, a crank handle acting on the said shaft for causing it to slide in the sleeve and for causing the pin of said shaft to slide in the helicoidal groove of the sleeve for the purpose of bringingabout variation in the respective positions of the opening sectors of the two shutters relatively to each other, a coupling device for rendering operative'the said crank handle for the motor mechanism of the camera in a conpivoted on the frame, a spring for pulling the upper arm of said bell crank lever upward, a finger on said arm for holding the free end of the first named lever and for retaining said lever inan elevated position of release, a manual con trol device for the raising and lowering of the said first named lever, saidmanual control device comprising an outer button which acts on the upper "arm of said bell crank lever so as to depress the said arm and to depress thereby the first named lever which it supports to bring about the coupling of said control device for the shutters to release the same from each other.

' -5. An 'obturating device for cinematographic 75,

cameras, comprising two shutters having opening sectors of the same size, the first shutter being fixed on a shaft, actuated 'by the, motor of the camera, the second shutterbeing fixed on a sleeve through which the first named shaftpasses, the sleeve being provided 'witha helicoidal groove," 5 theshaft having a pin entering the said groove,

" a crank handle acting on the said shaft for causing the pin of said shaft to slide in the helicoidal groove of the sleeve for the purpose of bringing about variation in the respective positions of the 10 opening sectors of the two shutters relatively to each other, 'a coupling device for rendering operative the said crank handle by the mot'ormechanism of the camera in a continuous and uniform way, said coupling device including a*1ever pivls otally mounted in slide friction on a shaft actuated bythe motor of the camera to be raised or lowered and to release or connect the device by means of which the shutters are coupled to each other, an automatic device for maintaining said 0 first named lever in its coupling position and for releasing it automatically, comprising a bel1 crank lever with two arms, a finger carried by the upper arm of said bell crank lever holding the first named lever and maintaining it in its release position, a finger carried by the-lower arm, a cam mounted loosely on the supporting shaft for 'the crank handle'which controls thedisplacementof the two shutters, said cam having two tips or points, the firsttip striking the pivot pin; of the rod through which sa d shaft is actuated,

a spring resiliently connectin said cam with said pivot and maintaining the said tip in contact with said pivot, the second tip abutting against the finger of the lower arm when the lever is in its raised position, and said first named lever when disengaged, and the said finger of the lower arm v disengaging from the second tip of the cam when said secondbell crank'lever is lowered by an outer button, the finger then being guided by the con- 40 tour of the cam, hich cam is actuated resiliently from the pivot of he rod with the control shaft so as to prevent the raising movement of the arm and of the first named lever, the last mentioned lever being held in position up to the end of the stroke of the cam and until the finger of the lower arm again comes into engagement with the second tip of the cam.

'6. An obturating device for cinematographic cameras, comprising two shutters having opening sectors of the same size, the first shutter being fixed on'a shaft actuated by the motor of the camera, the second shutter being fixed on a sleeve through which the first named shaft passes,

' the sleeve being provided'with a helicoidal groove,

the shaft having a pin entering the said groove of the sleeve, a crank handle acting on the said shaft for causing it to slide in the sleeve and for causing the pin of said shaft to slide in the helicoidal groove of. the sleeve for the purpose of bringing about variation in the respective posi-- tions of the opening sectors of the two obturators relatively to each other, a coupling device for rendering operative the said crank handle by the motor mechanism of the camera in a continuous and uniform way, said coupling device including a a lever pivotally mounted in slide friction on a shaft actuated by the motor of the camera to be raised or lowered and to release or connect the.

device by means of which the shutters are coupled to each other, an automatic device for maintaining the first named'lever in its clutch position and for releasing it automatically. Said device comprising a bell crank-lever withtwo arms, a

finger carried by the upper arm of the said lever e said lever imposition and main ing it in its position of release a'finger carried -the'rod which actuatesthe control shaft for dis- 5 placing the shutters from each' other,. a spring" by the lower arm. a rectangular shoe sliding on fixed at the end of the rodfor. pulling said rectangulai' shoe towards saidendand forcauslng i fit to engage the lower finger during a movement 1 cameras, comprising two shutters havingopening' sectors ofthesame size, the first shutter being fixed on a shaft actuated by the" motor of the camera, the second shutter being fixed on'a sleeve through which'ethefflrst named shaft passes, the sleeve being provided with a helicoidal groove, the shaft having apin entering-the said groove of the sleeve; a crank handle acting on the said shaft for .causing itto slide in the sleeve 'and' for causing the pin of said shaft to slide in the helicoi dal groove of the'sleeve for the purpose of bringing about variation in the respective position's of the opening sectors ofthe two shutters jrelatively to each other, a. coupling=device for rendering-operative the said crank handle for -camera,-a series of pinions mounted loosely onsaid shaft, said loose pinions being of dififerent on the lever being of'a size inversely proportional j I to the set of first, pinions, means for separately.

diameters and meshingswi-th loose pinioiis carried by the said lever 'theselas't (named pinibns rock ng the iirstpini'on's of the said sha'ft to actuate, them together, I said pinions' being fixed to each other and-one ofthem'eiigalging thepin ion on the cam so asto bring about that upon' locking together one of. the-first pinions of .the

I Y shaft, the eccentric or cam-shall be, aetuatedat a speed corresponding to said'firstnamed setol-bei'mparte'd to the cam-as desired, and hence -'progressive' displacement of] the two shutters from. each other being adapted to be exercised over'a, numberof gr'eat'er or. smaller series. of

cinematographic pictures.

' 8. An obtiirating device for cinematographic cameras comprising two shutters'having opening of the sleeve, a c'rank'handle acting onthe saidshaft for causing it to slidein the sleeve and for motor mechanismof the camera in a;- continuous, and uniform way-, 'said'coupling, device including V alever oscillating under. slide friction upon the seriesfof'pinidn's mountedloosely on said shaft,

; s'aid loose pinions;jbeingof different diameters;

andmeshin'g withiloose pinionscarried by said "lever, these last 'narned piniiins on the lever being 'ofasizednverslylproportional to the set of.flrst sectors of the same size, the-first'shutt'er being fixed onashaft actuated-by the motor of the. -can era,,the second shutter'being fixed on aisleeve through which thefirst namedshaft passes,'the sleeve-being provided with a- ;helicoidal .g'roo've,

the'shaft having" a pin entering the said-,groove causing the pin or said shaft to slide-inthe heli .coidal groove of thesl'eevefor the purpose of bringingfabout variation-in'the respective posishaft controlled :by-th e motor of the camera, a

and one of them engaging'the pinion o'n the-cam soas to bring-about that upon locking together one of the first pinions of the shaft, the eccentric or cam'shall'be actuated-at a speed 'correspond-' ing to said first named selected pinion, variable y 315 055, said. pinions being fixed to a tin speedsalso being adapted to be imparted to the mam asdesired, 'andhence progressivedisplacemerit of the two shuttersfrom each other being ada'ptedt'o be exercised over alnumber of greater or. smaller series of cinematographicj pictures,

means for fixedlycombiningthe 'pinions which 15, supports the said pinions, a spring fixed to said 5 rod, a finger atthefree end of the spring, a slot in the shaft along. one of its generatrix lines to permit the'entryof the said projection, sockets -in thesaid'pinions at the point of contact withthe shaft, a recessinthe rod to receive the spring, and its pin when the l1a;tt er does not enter the bring about the entry of the projection of the socket of one of the, pinions,-an outer-buttontos cause said rodto slide in the shaft, and also-to. 2

spring 'in' the -socketof one of the pinions cor responding-to the speed whichthe cam is to the motor mechanism of the camera in a" contin-- A nous-and uniformway', said clutching device in:

cluding a lever oscillating under slide friction" upon-the shaft' controlled by; the motorfof the have.

-.9. ,An obturating device for cinematographic cameras comprising two shutters having opening sectors of thesame size,'t-he-'first shutter being fixed on' '.a shaft -actuated-by the-motor of the sleeve being provided with a helicoidal groove,

the shaft-having a pin -entering the said groove} of the sleeve,'a crank handle acting on the said shaft for causing it to slide in the sleeve and for causing the pinof saidshaft toslide in'the helibringingaboutvariation in the respectiveposig tions of-the opening sectors-oi'the two shutters relatively'to each other; a coupling device for. renderingoperative the said 'crank handle forlected'pinion, variable speeds also being adapted eoidal groove of the sleeve for thepurpdse oi selectedpinion, variable speeds also being adaptcised over a number of greater or sniallerseries of; cinematographic pictures, means for f fixedly- -cluding a levler oscillating under slide friction, -upon the shaft contr'olled bythe motor of the camera, a; series-of pinions mounted loosely 'son said shaft,'said loose pinio'ns being of different diameters, andmeshingjWithloose pinionsjcarv. ried by the said lever, these last named piiiions on the leverbeingof a size inversely, pr'oportional to 'the'set offirst pinionasaid pinions be ing-fixed to each other and one'ofthem-engaging thepinion ,on the cam so as to bring about that- 'upon locking together one 'of' the first pinion's of the shaft, the eccentric or cam shall be actuated at a speed corresponding to said first named f 'ed to be imparted to the cam as desired, and

hence progressive- -disiilacem-eri't, of the two isl' u't ters from each other being'adapted to'be.exer-" tions'of-the'ope'ning sectors of-the two shutters 1 --relatively: to each other; a. coupling device forrendering operativethe said crank handle for the combining the pinionswhich areloosely inounted on the control shaft withsaid shaft, said'n' eans comprising aPslide' rodmovablein theinteriorof the shaftzinthat part which suppo'rts the said pinions, a spring fixed to said rod, ai-fin ger at the, free end of thejspring, aislot'i'n 'theshaftaion'g 'o'ne'of its generatrixlin'es to'pfimitth'e entry of the-said projection soekets in the 'said pignions" atthe point of :contact with the 'shaft; a recess in therod-toreceive the-spring,'ahd it pm w '1 i the latter does not enter the socket of one of the wire such as a piano wire, one end oi which is pinions, an outer button to cause said rod to slide fixed to the slidable pin in the actuating shaft,

in the shaft, and also to bring about the entry and the other end of which is bent back to form of the projection of the spring in the socket of a. projection which must engage in the sockets one of the pinions corresponding to the speed provided in said pinions upon sliding of said rod.- 5 which the cam is to have, the spring for the pinions of variable speeds being formed by a steel JEAN WEISSBRODT. 

